LG GR-559JPA Service Manual page 31

2. Buzzer Drive Condition Check
Condition
Tone (Beep~) when the button on the display is pushed Alarm for open door (beep-beep-beep)
Measure-
ment Location
5 V
IC1 ( )
A
0 V
5 V
0 V
IC1 ( )
B
3. Open Door Detection Circuit Check
Measurement
Location
Freezer/
Refrigerat Door
Closed
Open
0.1 s 0.5 s
1.9 kH (Beep~)
z
(PIN NO.15)
0 V
5 V
- 31 -
0.5 s 0.5 s
5 V
0 V
5 V
0 V
1.9 kH (Beep~) OFF
z
OFF
0 V
0 V